Biology learning in the 21st century leads to the empowerment of metacognitive skills. Increased metacognitive skills can support concept understanding and maximize the students’ retention of concepts. This research aimed at investigating the effect of project-based learning strategy on metacognitive skills, concept understanding and retention of class X students of Senior High School 1 Kairatu, West Seram District, Maluku. This research is a quasi-experimental research using pre test-post test nonequivalent control group design. The samples of this research were all students of classX1 of Senior High School 1 Kairatu. The data obtained in this research were the learning results of metacognitive skills, concept understanding, and retention of the students. The data were analyzed by using analysis of covariance (ANCOVA). The research results showed that the implementation of project-based learning strategy had a significant effect on students’ metacognitive skills, concept understanding, and retention. Furthermore, the results of post hoc LSD test showed some differences in the notation between the project-based learning strategy and the conventional learning strategy. These results indicated that the learning stages of projectbased learning strategy could empower the students’ metacognitive skills, concept understanding, and retention.

1. Journal of Education and Learning (EduLearn)
Vol. 13, No. 1, February 2019, pp. 104~110
ISSN: 2089-9823 DOI: 10.11591/edulearn.v13i1.11189  104
Journal homepage: http://journal.uad.ac.id/index.php/EduLearn
The influence of project-based learning strategies on the
metacognitive skills, concept understanding and retention of
senior high school students
Dominggus Rumahlatu, Kristin Sangur
Biology Education Study Program, Pattimura University, Indonesia
Article Info ABSTRACT
Article history:
Received Sep 15, 2018
Revised Oct 29, 2018
Accepted Nov 12, 2018
Biology learning in the 21st century leads to the empowerment of
metacognitive skills. Increased metacognitive skills can support concept
understanding and maximize the students’ retention of concepts. This
research aimed at investigating the effect of project-based learning strategy
on metacognitive skills, concept understanding and retention of class X
students of Senior High School 1 Kairatu, West Seram District, Maluku. This
research is a quasi-experimental research using pre test-post test
nonequivalent control group design. The samples of this research were all
students of classX1 of Senior High School 1 Kairatu. The data obtained in
this research were the learning results of metacognitive skills, concept
understanding, and retention of the students. The data were analyzed by
using analysis of covariance (ANCOVA). The research results showed that
the implementation of project-based learning strategy had a significant effect
on students’ metacognitive skills, concept understanding, and retention.
Furthermore, the results of post hoc LSD test showed some differences in the
notation between the project-based learning strategy and the conventional
learning strategy. These results indicated that the learning stages of project-
based learning strategy could empower the students’ metacognitive skills,
concept understanding, and retention.
Keywords:
Concept understanding
Metacognitive
Project based learning strategies
Retention
Copyright © 2019 Institute of Advanced Engineering and Science.
All rights reserved.
Corresponding Author:
Dominggus Rumahlatu,
Biology Education Study Program,
Pattimura University,
Ir. M. Putuhena Street, Kampus Poka-Ambon 97233, Indonesia.
Email: dominggus_amq@yahoo.co.id
1. INTRODUCTION
Biology learning in the 21st century is directed to student-centered learning. The orientation of
student centered learning is to emphasize the student learning on inquiry or investigation. Windschitl [1]
explains that the main focus of the students’ 21st century learning is to solve complex problems, and the
students’ learning activities are focused on collecting relevant information, collecting data, testing the model,
learning new concepts required to understand problems.
Biology learning process should also improve the skills of the 21st century, because the 21st century
skills include logical thinking skill, metacognitive skill, and entrepreneurship thinking [2-4]. Metacognitive
skill, one of the 21st century skills, can be interpreted as thinking about thinking. Tan [5] states that in the
21st century learning, students need metacognition as key to enhancing their thinking skills. Similarly,
Greenstein [6] and Harun [7] explain that the demands of 21st century learning are that students know not
only about the content of learning but alsoabout how students learn and develop their metacognitive thinking
skills. Yusnaeni and Corebima [8] adds that the students who have good metacognitive skills can become
independent learners during the learning process. Independent learners means being able to determine how to

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learn, when to learn, and to manage their own learning as well as to evaluate the results of the learning
process. The development of the students’ metacognitive skills can help students understand the learning
process, thus, enhancing the students' concept gaining and retention. Listiana et al [9] found that independent
learners are responsible for the improvement of their learning, and they can determine the best instructional
strategies to accomplish the tasks set by the teachers.
Project-based learning strategy is a learning strategy which is oriented on investigation and requires
the students’ total activeness to complete a project. During the learning process, the teacher serves as a
facilitator and motivator to direct the students, so that the students can work on the project well and finish it
on time. He final stage of project-based learning is producing a scientific product in the form of scientific
papers, reports, posters, leaflets, or media that can be displayed to the other groups. Meanwhile, Thomas [10]
describes that project-based learning has five criteria, namely qustion-centered, constructivist-investigation,
independence, realism, and focusing on the problems that can lead the students to experience the
investigation process of the concepts and principles of the learning material. In line with the Thomas’
opinion, Bell [11] explains that in the project-based learning, students construct new knowledge and build on
the base knowledge, so that the students can master a lot of information when they learn by doing. Ilter [12]
explains that the project-based learning is learning with a scientific approach, enhancing metacognitive
strategies, producing a product which is suitable with the topic being discussed.
There have been many researches onthe empowerment of metacognitive skills. Yusnaeni and
Corebima [8] report that the integration of the SSCS + MS learning model has the potential to increase
students’ metacognitive skills. Listiana et al [9] report that metacognitive skills have a significant correlation
with Biology cognitive learning results. Sele et al [13] in his research using conventional learning, TPS, RT
and the integration of TPS and RT, reported that the metacognitive skills of senior high school students in
Malang taught by using conventional learning strategy were very low compared to those taught by using
TPS, RT and the integration of TPS+RT learning strategies. Furthermore, it was found that the lower the
metacognitive skills were, the lower the students' critical thinking skills were.
If the students’ metacognitive skills have a positive effect on students' concept gaining, the students’
concept gaining also has an effect on students’ retention. The research on the correlation between cognitive
ability and retention was also reported by Setiawati and Corebima [14] that there was a significant correlation
between the students’ average-ability and the students’ retention. Wicaksono and Corebima [15] report that
metacognitive skills have a positive correlation with the students’ retention. Thus, it can be concluded that to
improve the students’ retention, their metacognitive skills should be initially empowered. Some research
findings have shown that empowering metacognitive skills has an effect on the students’ cognitive abilities
and retention. However, there has not been any research investigating the implementation of project-based
learning strategy to empower students’ metacognitive skills, retention, and concept gaining on the concepts
of biodiversity. Therefore, the purpose of this research was to examine the effect of project-based learning
strategy on metacognitive skills, concept understanding, and retention of class X students of Senior High
School 1 Kairatu.
2. RESEARCH METHOD
2.1. Research Design
This research is a quasi-experimental research which is conducted to compare the effectiveness of
conventional learning strategy and project-based learning strategy in improving the students’ metacognitive
skills, concept understanding, and retention. Confounding variables such as gender, initial students abilities,
and students skills are controlled by placing heterogeneous students into study groups. The design of this
research was pre test-post test nonequivalent control group design Table 1.
Table 1. Research Design
Group Pretest Learning Strategy Posttest
Conventional Learning Strategy (Control) O1 X1 O2
Project Based Learning Strategy O3 X2 O4
Description:
O1 and O3 : Pretest
O2 and O4 : Posttest
X1 : Conventional learning strategy
X2 : Project-based learning strategy

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2.2. Research Sample
This research was conducted in Senior High School 1 Kairatu West Seram District. The sample of
this research was 40 students of class X Senior high school 1 Kairatu in the first semester of the 2017/2018
academic year.
2.3. Instruments
The instruments used in this research were int he form of an essay test using metacognitive rubric
and concept understanding rubric and retention developed by Corebima [16]. The essay test was given at the
begining (pretest) and at the end (posttest) of the research. Before used, the interusments had been validated
by experts.
2.4. Experimental Process
Two classes were used as the research samples, namely class X1 and X2. Class X1 was taught by
using conventional learning strategy, while class X2 was taught by using project based learning strategy. The
learning material used in this research was about Biodiversity. The conventional learning in the control class
was carried out by the teacher without any intervention from the researcher. The experimental class was
taught by using project based learning by the researcher. A pretest and posttest were administered before and
after the research was conducted.
2.5. Data Analysis
The data were analyzed by using ANCOVA test followed by post hoc LSD test (Least Significant
Different test). The pre test, metacognitive skills, concept understanding, and post test were used as the
covariates. Before the ANCOVA test was performed, the normality of the data were initially tested using
Kolmogorov-Smirnov test, and the homogeneity of the data was tested using Levene's test.
3. RESULTS AND ANALYSIS
The results of the normality test of the students’ metacognitive skills, concept understanding, and
retention using Kolmogorov-Smirnov test showed that the data were normally distributed (p>0.05). the
results of the homogeneity test of the students’ metacognitive skills, concept understanding, and retention
using Levene test of Equality of Error Variances indicated that the data came from homogeneous population
(p>0.05). Therefore, the data had normal distribution and were homogeneous. Thus, the covariance analysis
of the students’ metacognitive skills, concept understanding, and retention could be performed. The results of
ANCOVA test on the students’ metacognitive skills, concept understanding, and retention are presented in
Table 2; Table 4; and Table 6. While the LSD post hoc test of each variable is presented in Table 3; Table 5
and Table 7.
Table 2. The Results of ANCOVA on the Metacognitive Skills of Senior High School 1 Kairatu
Source Type III Sum of Squares Df Mean Square F Sig.
Corrected Model 1273.556A
2 636 778 20 242 .000
Intercept 14566.466 1 14566.466 463 046 .000
Pre-test 28 661 1 28 661 .911 .346
Strategy 1079.512 1 1079.512 34 316 .000
Error 1163.944 37 31 458
Total 306503.906 40
Corrected Total 2437.500 39
The results of ANCOVA test Table 2 show that the learning strategy variable has an effect on the
metacognitive skills of students of Senior High School 1 Kairatu (p<0.05). Once it was found that learning
strategy had an effect on the students’ metacognitive skills, the LSD test was then performed. The post hoc
LSD test was to determine differences in the metacognitive skills between the students taught by using
project based learning strategy and those taught by using conventional learning, as shown in Table 3.
Table 3. The Results of Post Hoc LSD Test on the Metacognitive Skills of the Students of Senior High
School 1 Kairatu
Class X Metacognitive Y Metacognitive Difference LSD Notation
Control_Conventional Strategy 6.59 27 20.41 a
Experiment_ Project-Based Learning Strategy 9.57 32.3 22.73 b

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Project-based learning strategy has better potential in improving students' metacognitive skills
compared with the conventional learning strategy with the score difference between the pretest and posttest
scores as much as 22.73 Table 3. The results of this research show that the implementation of project-based
learning strategy can train the students to be independent learners in planning the project, responsible for the
implementation of the project, and reporting the results / products obtained, so that their metacognitive skills
are empowered. When the students are engaging in the project-based strategy, their metacognitive skills,
whose characteristics include independence, planning, responsibility and evaluation, are raised and honed to
become more quality. Through the project-based learning strategy, the students’ metacognitive skills are
honed and developed. This is because the project-based learning strategy emphasizes on the students’
activities and on their cognitive constructivist. Tan [5] revealed that the project-based learning directed the
students to build their knowledge. Suwono [17] explains that the project-based learning is a student-centered
learning, using a variety of ways, and is an active learning approach in education. Thomas [10] and Hellstrom
et al [18] explain that one characteristic of the activity in project-based learning is that the projects involve
the students in a constructive investigation. Palennari [19] explains that through metacognition, students
become an independent learners, students can organize and plan the learning process. In line with this,
Yusnaeni and Corebima [8] and Corebima [16] reveal that independent learners are responsible for their own
learning progress and their own efforts, able to monitor and evaluate their learning activities before and after
the learning activity.
During the conventional learning strategy, the students were assigned to answer the student
worksheet. This made the students not learn to be independent and responsible for the planning process and
the resulting products. Therefore, the metacognitive skills of students in conventional learning class were
lower than those in the project-based learning strategy class. The research by Listiana et al [20] reported that
the conventional learning activity, such as answering student worksheets and discussions,made the students
passively receive information from teachers. In addition, such activity did not empower the students’ skills.
Project-based learning strategy can be used to enhance the students' concept understanding Table 4. The
research by Suparti [21] proves that the project-based learning can improve the students’ learning results, so
that the students’ research skill can be achieved because project-based learning facilitates the students to
identify problems.
Table 4. The Results of ANCOVA Test on the Concept Understanding at Senior High School 1 Kairatu
Source Type III Sum of Squares df Mean Square F Sig.
Corrected Model 300.833a
2 150.416 38.901 .000
Intercept 1480.507 1 1480.507 382.888 .000
Pre-meta 4.176 1 4.176 1.080 .305
Strategy 201.294 1 201.294 52.059 .000
Error 143.067 37 3.867
Total 36564.000 40
Corrected Total 443.900 39
The results of ANCOVA test Table 4 show that the learning strategy variable makes a difference
toward the concept understanding of the students of senior high school 1 Kairatu (p <0.05). This shows that
learning strategy has a significant effect on the students’ concept understanding. Having been found that
learning strategy has a significant effect on the students’ concept understanding, the LSD test is performed.
On the other hand, the post hoc LSD test Table 5 was performed to determine the significant difference in the
students’ concept understanding between the project based learning strategy and conventional learning
strategy. The results show that project-based learning strategy has a greater potential in improving the
students’ concept understanding than does the conventional learning strategy, with a score difference
between pretest and posttest as much as 4.19. The research by Koparan and Guven [22] reports that project-
based learning method is more effective than conventional learning method, moreover, project-based learning
can improve the students’ collaboration by using student-centered principle which is more effective and
efficient.project-based learning method is more effective than conventional learning method, moreover,
project-based learning can improve the students’ collaboration by using student-centered principle which is
more effective and efficient.
Table 5. The Results of LSD Test on the Concept Understanding of the Students of Senior High School 1
Kairatu
Class X Concept Understanding Y Concept Understanding Difference LSD Notation
Control_Conventional Strategy 22.79412 80.69853 57.9 a
Experiment_project based learning strategy 29.8913 91.9837 62.09 b

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The difference in the concept understanding between the students taught by using the project-based
strategies and those taught by using conventional learning strategy is because the students in the project
based learning strategy experienced a series of stages of doing a project. The implementation of the project
consists of some stages, namely planning, investigation, presentation of results / products, and evaluation. In
line with this, Han and Bhattacharya [23] state that the project-based learning consists of three stages, namely
planning, creation, and process. Furthermore, Colley [24] reveals that the project-based learning includes the
stages of identifying and determining a project, seeking information, planing the project, working on the
project, reporting the results of the project, and evaluating the project that has been carried out.
In the planning process, the teachers direct the students to develop questions about biodiversity
issues which are typical of Maluku, Indonesia. After that, the students are guided to prepare a design of
investigation procedures for problem solving. Project-based learning is a strategy to encourage students to do
research based on questions or problems [25]. The following stage is implementing the project through the
investigation procedure to investigate the diversity level of genes, species and ecosystems which are typical
of Maluku. Through this investigation procedure, the students are significantly trained to develop a concept
for themselves.
The research by Ergul and Kargin [26] showed that very few students forgot their experiences
during the process of project-based learning, because students could understand the concepts and were able to
make a presentation of it.The next stage to develop the students’ concept gaining is the presentation stage of
the results of the project in the form of posters or leaflets of biodiversity. Movahedzadeh et al [27] explains
that open discussion gives a contribution toward the students who have better understanding to share with
other students. Through this scientific sharing, the students also explain their understanding and the findings
of their projec. They even can tell about their confusion they encountered during the implementation of the
project. In line with this, the research by Thompson et al [28] reveals that students develop the level of their
concept understanding, problem solving and communication skills better, so that it helps them both in the
academic world and in the future. The use of project-based learning strategy can improve the students'
concept understanding of biodiversity better than the conventional strategy can.
A good metacognitive skill and good concept understanding will certainly have a contribution
toward the students’ retention. The effect of learning strategy on students’ retention can be seen in
Table 6 below.
Table 6. The Results of ANCOVA Test on the Retention of the Students of Senior High School 1 Kairatu
Source Type III Sum of Squares df Mean Square F Sig.
Corrected Model 1586.500a
2 793.250 244.027 .000
Intercept 126.857 1 126.857 39.025 .000
post_test 730.472 1 730.472 224.715 .000
Strategy 54.211 1 54.211 16.677 .000
Error 120.275 37 3.251
Total 275113.000 40
Corrected Total 1706.775 39
The results of ANCOVA Table 6 show that learning strategy variable makes a difference on the
retention of the students Senior High School 1 Kairatu (p <0.05). This shows that learning strategy has an
effect on the students’ retention. Having been found that learning strategy has an effect on the students’
retention, the LSD test is performed. The post hoc LSD test was performed to know the significant difference
in the students’ retention between the project based learning strategy and the conventional learning strategy.
The results of the LSD test are presented in Table 7.
Table 7. The Results of the Post Hoc LSD Test on the Retention of the Students of Senior High School 1
Kairatu
Class X Retention Y Retention Difference LSD Notation
Control_Conventional Strategy 75.3 77.3 2 a
Experiment_Project based learning Strategy 84.09 87 2.91 b
The project based learning strategy has a greater potential in improving the students’ retention than
does the conventional learning strategy with a score difference between pretest and post-test as much as 0.91
Table 7. Research shows that whenthe students who learn by using project-based learning strategy have high
metacognitive skills, they will also have a good concept gaining and retention. Similarly, Bahri [29] found

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that the use of appropriate learning strategies could empower the students’ metacognitive skills, so that it
could increase the students’ cognitive retention. The research by Listiana et al [20] also shows that
metacognitive skills are consistent and have a correlation with the improvement of the students’cognitive
ability. Retention is an ability of memory to store information within a specified period. In this case is the
students’ retention ability of the biodiversity material. Anderson and Krathwohl [30] explain that retention is
the ability to remember learning material until a certain period of time. The students’ activity during the
project-based learning strategy supports the students’ retention ability. During the process of collecting
information and doing investigation, the students discover concepts and experience real and meaningful
learning. Gaines [31] states that one of the factors that affect student retention is meaningful learning,
because when the learning material is meaningful, the students will understand it more easily.
Through this research, the students are invited to do a project on biodiversity which is typical of
Maluku. In this case, the students will study the conditions and living things around them, so that it will
become a meaningful experience for them. The research by deWinstanley and Bjork [32] reported that the
students would remember the information they discover by themselves better than that they read. Retention is
also associated with the student's ability to store information in long-term memory. The information which is
obtained from doing a project and meaningful learning will certainly be stored in long term memory. This
can increase students’ retention better than the conventional learning strategy. Furthermore, Finley et al. [33]
states that the students constructing knowledge by themselves will have an effect in their involvement in
learning, encoding information, so that the information stored in long term memory can be quickly retrieved.
4. CONCLUSION
Based on the results of this research, it can be concluded that the implementation of project based
learning strategy can improve metacognitive skills, concept gaining, and retention on biodiversity learning
material of the students of Senior High School 1 Kairatu. This is proven with the differences in the notation
which indicate that project-based learning strategy can improve metacognitive skills, concept, and retention
more significantly compared to the conventional learning strategy done by the teacher.
ACKNOWLEDGEMENTS
The author would like to thank the Biology teacher of Senoir High School 1 Kairatu, West Seram
District of, Maluku, who has given an assistance in the data collection. The author also thanks the Faculty of
Teacher Training and Education Sciene, Pattimura University that has funded this research through grant
research of social, humanities and education fiscal year 2017 in accordance with Rector Decree No.
630/UN13/SK/2017, dated June 12, 2017.
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